Motor choice based on Kv

[WuTangcl]

Hi People,

been reading a lot but now I got a question of my own...

I am planning on buying a Z20 for my hurri, but i got a quetion
some of you could probably answer through experiance of knowledge...

I got stok 870Kv Gaui motor, with 2100 HS, But want to hit the 2400's
Whats the better choice then ?

Z20 1470Kv with a little smaller pinion
or
Z20 980Kv with a little bigger pinion ?

(I fly on 8S A123's on stock 50A Gaui ESC)

Thanks in advance for answering
Roel

[concept1]

depends on just what you want to do! are you after flight time or performance. and do you just want good performance or ballistic!
the 890 will give good performance and decient flight times.
the 1470 will give great performance but will lack flight times. 8s A123 will probably be over it's max RPM but on 7s A123 would be ok but could probalby be 3-4 minute flights

for a wild 3D guy the 890 will be lacking in performance, although on 8s A123 it won't be too bad.

i am running the RCP 1000w 1100kv motor, and I have pretty good performance, and 4.5 minute flights

[WuTangcl]

mmmm both options sound good,

But the good performerance en decent flight times of the 980 do the trick I think,

Whats the performerance of the z20 980 in comparison to the 870 stock Gaui motor ?
Is it just more efficient or is there even a little increase in performerance ?

what Im really looking for is a tad more power while flight times stay at least the same
and I want higher headspeed, around 23 to 2400
My cuurent flight time with 8S A123 and the stock motor and ESC is 4,5 minutesm
and thats on the safe side, because I can fly 5 minutes but the I only got like 15 to 20 secs to land
because the A123's are drained.

As for flight times to be 4,5 minutes, I dont really care, because I got 3 sets 8S (2x4s) and
a Huge 30v/30a powersupply so all my (6x4S) packs are charged in 12 minutes.

[Vinger]

kV should never be the only deciding factor, the Watts the motor are capable of is the figure to look at for performance. Any of the two motors mentioned are capable of giving you the higher headspeed if geared for it. My experience is that you have to run BL motors at their most efficient rpm. The 980kV (1000W) motor is great if you gear it for 2000 rpm HS, not ballistic but way better than stock. The 1100kV (1100W) is better for more power at a headspeed of 2200rpm, but would lessen the flight time.

kV should be matched to the intended volts (cell count) you would use and then you should choose the watt value to determine power. Great example is if you compare the TT E550 with the E620, both have Z30 motors, but the E550 a 1100kV intended for 6 cell and the E620 a 800kV intended for 10 cells. Both motors give excellent performance for their intended voltages with the 800kV motor producing approx 1900 Watts and the 1100kV motor about 1300 Watts.

All motors can be geared to give a certain hadspeed, but might not be efficient or running in their powerband.

[ps61785]

The Scorpion HK3026-1210 is a 1210Kv motor and is awesome in both power and efficiency...

I did a 10 minute run time yesterday with hovering and collective pops...

13 tooth pinion...
20 Auto Gear...
Stock gearing otherwise...
Flying 6s Setup 3700mAh Evo 25 FP Packs

Seemed to have plenty of headspeed even at 90% throttle...

[L0stS0ul]

I'm trying to figure the same thing out. I currently have the stock 860kv motor (i think that's right) and I'm looking to upgrade. I fly dual 2500mAh 11.1v Evo 25 packs on the heli and I can't afford to upgrade the batteries at this time. The heli's already cost me over 1k to this point so I'm looking for the best motor for the setup I have. I know very little about the different gearing options on the heli and what would be the best to get decent mild 3D performance out of the heli while still getting ok flight time out of the dual 2500mAh packs. If I can have 5 minutes per flight I'd be happy.

What would you recommend? I only have enough cash to upgrade the motor. I already have the shortend boom, RCP CF 500mm blades, CNC flybar cage, and CNC antirotation bracket, Lightend paddles and tail blades. The stock motor is just missing that little bit of umph for me

[Vinger]

I'm trying to figure the same thing out. I currently have the stock 860kv motor (i think that's right) and I'm looking to upgrade. I fly dual 2500mAh 11.1v Evo 25 packs on the heli and I can't afford to upgrade the batteries at this time. The heli's already cost me over 1k to this point so I'm looking for the best motor for the setup I have. I know very little about the different gearing options on the heli and what would be the best to get decent mild 3D performance out of the heli while still getting ok flight time out of the dual 2500mAh packs. If I can have 5 minutes per flight I'd be happy.

What would you recommend? I only have enough cash to upgrade the motor. I already have the shortend boom, RCP CF 500mm blades, CNC flybar cage, and CNC antirotation bracket, Lightend paddles and tail blades. The stock motor is just missing that little bit of umph for me
If you only want to buy once, buy the 1100kV Z-Power motor and run it with a 13 teeth pinion with the 20t OWB. This should give you at least 4 min of hard flying on your batteries or 5-6 min of mixed flight. Remember the packs will take a beating but the EVO 25C packs should handle it. Just my humble opinion as I bought the Z Power 980kV first and was a little bit dissappointed, but the Z-Power 1100 KV or the Z30 is awesome. the Z30 hard on batteries though, need min 3300mAh 20C batteries.

[mjdee14]

http://www.helifreak.com/showthread.php?t=57435

Look at the above thread...I did a comparison of the stock 890 Gaui motor tho my new Z20 -980 motor....

The Z20 is real easy on packs and I get very good performance and flight times on a 14t pinion....runs about 1900 rpm headspeed.

Right now I fly FF, Loops, stall turns. hard max pitch climbs and turns...and am learning more as I go.

I can use 2200 25c hextronic packs for a solid 5 minutes of flying....

If you need 3d performance then go for a bigger motor....but at the expense of your lipos....

You can't go wrong with a Z20 -980 and and it doesn't work for you...they are always in demand and can be sold easily. I have another carbon frmed 550 and I see no reason to use anything other than the Z20 for my style of flying...

Do a search on Z20 and Z30 and you should get lots of info...Scopian is also supposed to coming out a new motor that is supposed to be good in the 550.


Mike D

[skydude]

[QUOTE=mjdee14;580324
I can use 2200 25c hextronic packs for a solid 5 minutes of flying....

Mike D[/QUOTE]

Hey Mike,

I have been shopping for a second set of packs. Looking around at the hextronics I came across a forum where 5 guys had a horror story. Made me back off. Don't remember the dates of the tales.

You seem happy with them?


qoute ps16785 - "I did a 10 minute run time yesterday with hovering and collective pops..."


I would love 10 minutes. Might get there. I fly like someone's granny.


--

[mysticmead]

at one time the HTX packs did have a problem puffing with even mild use (or even sitting on your bench)... it wasn't only HTX that had the problem it was a manufacturing issue (there are only a handful of Lipo manufactures) . that has been dealt with and is no longer a problem.. I saw a bunch of those posts too before I bought my HTX 2200 packs for my 450, I can tell you that these packs can take a beating and come back for more. yesterday I kinda of did an opps and didn't start my timer. I took one pack down below 9v (8.67v) no swelling and the pack did take a charge back to full levels with NO problems. At $26 per pack you can't really go wrong with them...

[vicrc]

With the Z20 980kv you can't tic-toc fast, I end up doing rainbows instead. But its great motor for learning how to do them. Vinger has the same experience I am having and when I get better I will end up in the end getting a Z30 but then I would also have to change out my stock ESC.

[mjdee14]

Hey Mike,

I have been shopping for a second set of packs. Looking around at the hextronics I came across a forum where 5 guys had a horror story. Made me back off. Don't remember the dates of the tales.

You seem happy with them?


--

So far I only have about 6 flights on them...but I have checked the packs after charging and each cell is almost identical to the others....it seems to take exactly what my E logger says was taken out of it....

Only time will tell....for $27 each...I thought I would take a chance....the Z20 is very easy on them so they are not being overworked....I don't think I would have purchased them had I decided to keep using the stock Gaui motor.

I'll post if I ever run into problems with them...

[concept1]

the more I see on motor perfromance, I would have to say if you are running the stock 890 motor and want more performance and want a motor NOW, get he Z30 1100kv, you will drop to 4-5 minute flights but you will get much better performance,and you will transform your Hurri into a new heli! if all you are looking for is a little more, but you are basically happy with your current performance then get the Z20 980. or if you want to try 8s A123 get the Z20.

but I personally would wait for the new scorpion line up to come out this month!!! I love my RCP motor which gives performance that Rivals a Raptor 50 with a muscle pipe and 4.5 minutes of flight on 2500mah, the scorpion is supposed to do just as good or better and might be more efficient!

[L0stS0ul]

I'm in no hurry to buy. The heli flies well on the stock motor. I definitally can bog it down pretty hard but being winter I've only gotten to fly like 3 times in the last 3 months so waiting a while longer for a better motor is fine with me.

[WuTangcl]

Guys, i couldnt wait,

I followed ya'lls advice and bought me a Scorpion HK-3026-1210 (http://www.innov8tivedesigns.com/product_info.php?cPath=21_25_65&products_id=311)
Got some high expectations for this motor, and I think I cant go wrong...

My 8S A123's will have no prob feeding that little monster,
I'll letcha all know what it will do in the Hurri once I receive that motor
for now its not in stock, according to my confirmation purchase mail it
will arrive somwhere aroud the end of the month...

CANT WAIT TO TEST IT ;) ;)

[ps61785]

qoute ps16785 - "I did a 10 minute run time yesterday with hovering and collective pops..."


I would love 10 minutes. Might get there. I fly like someone's granny.


--


Remember, this was simple forward flight and some pops to see how much power seemed to be there and on 3700mAh packs none the less...

I was impressed to see that there was very minimal "bog" on the head using full collective.

I am being soft with the heli as i just got done building it and want to break in all the parts before beating on it...i have already had a defective RCP H18 motor that had alot of power as well but it was much harder on batteries even in 1 flight that i was able to put on it...

Overall i have 3 full "soft" flights on the heli with the scorpion motor and seem to be right around 8-10 mintues...depending on if i go into the Idle 2 (90%) right away or if i stay in Idle 1(70%) for a minute or two and then into Idle 2...